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<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        h1{
            color: red;
            font-size: 60px;
        }
        h2{
            color: green;
            font-size: 40px;
        }
        img{
            width: 400px;
        }
    </style>
</head>
<body>
    <h1>欢迎来到尚硅谷学习</h1>
    <h2>这是二级标题</h2>
    <img src="a.jpg" alt="侧视图">
</body>
</html>